"The United States strongly condemns the use of chemical weapons to conduct an assassination", Ms Nauert said in the statement.

The investigation found Kim Jong-nam was murdered with the highly toxic liquid nerve agent VX used as a chemical weapon, resulting in automatic sanctions in compliance with the Chemical and Biological Weapons Control and Warfare Elimination Act of 1991. He also promised to freeze nuclear missile tests during the dialogue, the South Korean official said.

A statement from the South Korea president's office said: "The North showed willingness on denuclearisation in the Korean Peninsula".

"Certainly it's positive but we have to take this sign, this gesture to talk, not only with a grain of salt but with perhaps an entire salt block", said Gardner.

South Korean officials had a four-hour dinner with Kim Jong-un on Monday. He added dismantling the program is the end goal. "I believe that North Korea's gesture may create space for talks about talks between Washington and Pyongyang, but it remains to be seen whether the two sides can find a common basis upon which to enter into denuclearization negotiations", he told the Nikkei Asian Review.

Additionally, the North has pledged to never use nuclear or conventional weapons against South Korea.

"All options are on the table and our posture toward the regime will not change until we see credible, verifiable, and concrete steps toward denuclearization", stressed Pence.

Moon acknowledged that nothing has been settled regarding the North's abandonment of its nuclear program.

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"We cannot reveal everything to the media, but we do have additional views of North Korea we will relay to the United States when we visit the U.S.", said South Korea's head of national security Chung Eui-yong.

Capitalising on warmer ties after the Pyeongchang Winter Olympics, Mr Kim and South Korean President Moon Jae-in have arranged a landmark meeting for next month.

Trump says he hopes the North Koreans are "sincere".

South Korea has kept the United States updated on its diplomatic trip to North Korea and the administration plans to discuss the developments from the trip in more detail with South Korea and Japan later this week.

The North has repeatedly said in the past that it won't negotiate over its nuclear program and vowed to bolster its nuclear and missile arsenals. Officials said she was the first immediate member of the North's ruling family to visit the country.

Chung said the two Koreas agreed to hold their summit at a Seoul-controlled facility inside the border village.

"The South and North agreed to hold the third South-North summit talks at the Peace House in Panmunjeom in late April and to proceed to a specific working-level coordination for this".

If the meeting proceeds as planned, it would mark the first time that leaders of the two Koreas have engaged with each other since October 2007, when the late North Korean leader Kim Jong Il - Kim Jong Un's father - sat down with then-South Korean president Roh Moo-hyun.

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